How can PHP developers ensure that the $_GET variable is properly sanitized and validated before using it in a database query?

Developers can ensure that the $_GET variable is properly sanitized and validated by using PHP functions like filter_input() or htmlspecialchars() to sanitize the input and validate it against expected values. It's important to always validate user input before using it in a database query to prevent SQL injection attacks. 

// Sanitize and validate the $_GET variable before using it in a database query
$id = filter_input(INPUT_GET, 'id', FILTER_VALIDATE_INT);

if ($id === false) {
    // Invalid input, handle error
} else {
    // Use $id in a safe database query
}

Keywords

$_GET variable sanitization validation database query security SQL injection

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